Find the slope of the line passing through the points , −54 and , 3−3

To complete your spring schedule, you must add calculus and physics. at 9: 30, there are three calculus sections and two physics sections; while at 11: 30, there are two calculus sections and three physics sections. how many ways can you complete your schedule if your only open periods are 9: 30 and 11: 30?

Can some one me with these questions

I’m really confused and need your assist me with this question i’ve never been taught